document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1012409>Question 1012409</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An airplane takes  5  hours to travel a distance of  4200km  against the wind. The return trip takes  4  hours with the wind. What is the rate of the plane in still air and what is the rate of the wind? </SPAN>\n" );
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document.write( "R=rate of plane; W=rate of wind<BR>\n" );
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document.write( "Against wind:(5 hours)(R-W)=4200km<BR>\n" );
document.write( "R-W=840<BR>\n" );
document.write( "R=W+840<BR>\n" );
document.write( ".<BR>\n" );
document.write( "With wind: (4 hours)(R+W)=4200km<BR>\n" );
document.write( "R+W=1050<BR>\n" );
document.write( "(W+840)+W=1050<BR>\n" );
document.write( "2W=210<BR>\n" );
document.write( "W=105<BR>\n" );
document.write( "ANSWER 1: Rate of wind = 105 km/hr.<BR>\n" );
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document.write( "R=W+840<BR>\n" );
document.write( "R=105+840<BR>\n" );
document.write( "R=945<BR>\n" );
document.write( "ANSWER 2: Rate of plane in still air = 945 km/hr.<BR>\n" );
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document.write( "CHECK:<BR>\n" );
document.write( "(5 hours)(R-W)=4200<BR>\n" );
document.write( "(5hrs)(945-105)=4200<BR>\n" );
document.write( "(5hrs)(840)=4200<BR>\n" );
document.write( "4200=4200<BR>\n" );
document.write( ".<BR>\n" );
document.write( "(4 hrs)(R+W)=4200<BR>\n" );
document.write( "(4 hrs)(945+105)=4200<BR>\n" );
document.write( "(4 hrs)(1050)=4200<BR>\n" );
document.write( "4200=4200<BR>\n" );
document.write( ".<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );